New to making mods

[Neo22353]

I was trying to create a mod that had a start race of werebears, and maybe further down the line allowed for any playable character to obtain the power but I can't seem to figure it out. I can't use external sources, and I got the race in to the menu and select-able but they don't get the werebear beast form or any beast form for some reason. If you can please help.

 

That's a post I made from Steam looking for help, I'm new to Making mods I have done some characters but that is about it, I'm trying to make it to where players can start as a werebear, and later on I want to make it obtainable through maybe a quest or possibly disease, and until I get a better rig set up for my computer me and my wife play on the PS4. We want to make a non-replacer mod with no external assets if any one can help it would be much appreciated.